[hiphipjorge]

Well, you still need some transpiling in order to remove the Flow type signatures. In practice, they end up being pretty similar in terms of needing a build step.

[TAForObvReasons]

You can embed the type information in special JS comments that the checker understands: http://flowtype.org/blog/2015/02/20/Flow-Comments.html

Your existing minification step will remove the comments. But even if you don't remove the comments the code will still run.